| Boom to Calafell | 695.71 mi (1,119.64 km) |
| Boom to Calahorra | 676.43 mi (1,088.61 km) |
| Boom to Calasparra | 935.95 mi (1,506.26 km) |
| Boom to Calatayud | 730.52 mi (1,175.66 km) |
| Boom to Caldas de Montbuy | 661.25 mi (1,064.18 km) |
| Boom to Caldas de Reyes | 846.86 mi (1,362.89 km) |
| Boom to Calella | 659.04 mi (1,060.62 km) |
| Boom to Callosa de Segura | 931.34 mi (1,498.85 km) |
| Boom to Calpe | 884.69 mi (1,423.77 km) |
| Boom to Calvia | 800.84 mi (1,288.84 km) |
| Boom to Camas | 1,073.94 mi (1,728.34 km) |
| Boom to Cambados | 857.64 mi (1,380.24 km) |
| Boom to Cambre | 801.79 mi (1,290.36 km) |
| Boom to Cambrils | 709.82 mi (1,142.35 km) |
| Boom to Campo de Criptana | 884.43 mi (1,423.35 km) |
